When buying castor oil, you want to purchase the organic, cold pressed castor oil to reap all the benefits we talked about before. This is important, because commercially made castor oil is artificial, and the results of using it are unknown and vary. Though, it is also important to note that some people have an allergy to organic castor oil. So always do a skin test on your arm or behind your ear, and wait 24 hours to see if you have any allergic reaction to the oil.